Rulings

• 2008-05-01
  You target the player when the ability triggers. You won’t know which card is discarded until the ability resolves.
• 2008-05-01
  Cragganwick Cremator deals damage equal to the discarded creature’s power as it exists in the graveyard. (This can matter for certain creatures with variable power, such as Maro or Tarmogoyf.)
• 2008-05-01
  If you have no cards in hand when Cragganwick Cremator’s ability resolves, you don’t discard anything.
• 2020-08-07
  You choose the target player or planeswalker when the ability is put onto the stack. You won't know how much damage will be dealt until the ability resolves.
• 2020-08-07
  If the target player or planeswalker is an illegal target by the time the ability tries to resolve, the ability won't resolve. You won't discard a card.
• 2020-08-07
  If you have no cards in hand when Cragganwick Cremator's ability resolves, you don't discard anything.
• 2020-08-07
  Cragganwick Cremator deals damage equal to the discarded creature card's power as it exists in your graveyard.